<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/1.10.0/jquery.min.js"></script>
    <script src="./js/1.2 多态.js"></script>
</head>

<body>
</body>

</html>